Device for forming projections on sides of hollow details

ABSTRACT

The invention consists in a device for forming projections on the sides of hollow workpieces with the aid of punches introduced inside a workpiece and forming rollers mounted on rotary and advancing heads arranged outside the workpiece.

References Cited UNTTED STATES PATENTS Frank...

Sebell Burns...

Mazur........

ABSTRACT The invention consists in a device for forming projections on the sides of hollow workpieces with the aid of punches in- 7 Claims, 3 Drawing Figures Primary Examiner-Charles W. Lanham Assistant Examiner-Michael J. Keenan Attorney-Waters, Roditi, Schwartz & Nissen troduced inside a workpiece and forming rollers mounted on rotary and advancing heads arranged outside the workpiece.

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PATENTEDFEB22 |s12 SHEET 2 OF 2 The present invention relates to devices for forming projections on the sides of hollow work pieces and which may be used for making side projections on the base sockets of radio tubes and electric lamps, wherein the projections serve for securing the lamp in the socket of the electric system.

Usually, such articles are manufactured in multiple dies, wherein a socket is first stamped to provide openings in its sides, projection blanks are then separately stamped, and subsequently press-fitted into the socket openings.

In that case, there are affected a number of unproductive operations, resulting in a low efficiency in the use of the known devices. The quality of articles obtained is also rather poor due to inaccuracies encountered in assembling the projections and socket.

It is also known to manufacture such articles by stamping the sockets, followed by annealing them in order to relieve residual stresses and by a multioperational drawing of the projections.

The drawing of the projections is effected by two punches which are introduced inside the hollow interior of a workpiece and, simultaneously, imparted displacement in the direction of dies arranged outside the workpiece.

However, in the latter case, the process of manufacturing articles is likewise noncontinuous and of a low efficiency due to drawing which requires an increased quality of materials and also requires diverse technological equipment. Additionally, the yield of good articles is rather low due to metal ruptures encountered when drawing projections.

it is an object of the present invention to eliminate the above-mentioned disadvantages of the known devices.

The main object of the present invention is to provide a more efficient device for forming projections on the sides of hollow workpieces through improved punches and dies.

According to the invention, the proposed improvement consists in that the punches are rigidly secured on a stationary support and arranged in the ports of a hollow arbor which carries a workpiece, the punches holding the arbor at the end of the support so that the arbor is capable of moving across the support and along the punches, as well as in that each die consists of forming rollers mounted on rotary heads which are connected with a drive ensuring their alternate reciprocation toward and away from the arbor for forming projections on the workpiece.

The arbor displacement across the support is effected in the course of forming projections in view of the fact that the arbor is set on the support with a clearance from the side of the punches and is held thereon in a middle position by two flat springs arranged parallel to the support.

in a preferred embodiment of the invention the drive serving to displace the heads comprises spring-biased wedgeshaped elements connected with the heads and which cooperate with rollers set on turning levers which are secured on a progressively movable crosspiece, while, in order to effect alternate displacement of the heads, the wedge-shaped element of one head is turned through 180 relative the other wedge-shaped element.

in this instance, it is expedient that opposite the inclined plane of the wedge-shaped elements there are arranged guides which are adapted to press the rollers of the turning levers against the inclined plane of said wedge-shaped elements during the crosspiece displacement.

It is also expedient that on the crosspiece, extending coaxially with the stationary support, there is secured a springbiased pointed rod adapted for centering the workpiece relative to the arbor. The rod is arranged in a hollow spring-biased rod which effects additional centering of the workpiece with its sides and which carries a spring-biased clamp for positioning the workpiece on the arbor.

in order to remove a finished article from the arbor, a plate is movably mounted on the support below the arbor, said plate resting against a cross bar which, by means of rods, is aligned with the progressively movable crosspiece.

A primary advantage of the present invention consists in improving the quality of manufactured articles, since the steps of drawing and pressing out the metal when forming the projec tions are combined in view of the fact that the arbor, together with a workpiece located thereon, is displaced by the head by means of rollers relative to the stationary punches, and with any mechanical stresses produced on the operating tool (forming rollers and punches) being insignificant.

Another advantage of the invention lies in the reliability and simplicity in the operation of the proposed device, as well as the provision of a simpler process of manufacturing articles having side projections, since the continuous manufacturing process (requiring no annealing, separate manufacture of the projections and their pressing in, or multioperational drawing) can be carried out on a single multistage press.

Still another advantage of the invention is a high production efficiency responsive to the utilization of the forward and reverse strokes of the crosspiece for the alternate forming of projections, which allows for the maximum production time for effecting the projection forming operation while concurrently cutting down time losses for idling.

Considering now a detailed description of an exemplary em bodiment of the present invention, with reference being had to the accompanying drawings, wherein:

FlG. ll shows the device according to the present invention, the crosspiece being in the upper position;

H6. 2 is a partial view of the device (on an enlarged scale) at the site of the arbor; and

H6. 3 is a view in the direction of the .arrow A in H6. 2.

Referring now to Fit]. ll, the device consists of two parts, a lower part I and an upper part ll, respectively mounted on a table l and on a slide 2 of a press, or on some other suitable equipment in which the upper part is movable with respect to the lower one.

In the lower part l of the device there is provided a base plate 3 having a central recess ll in which a stationary support 5 is mounted.

This portion is shown in greater detail in lFlG. 2. Proxirnate to the end of the support 5, in an opening perpendicular to its axis, there are arranged punches 6 and 7 which are rigidly held in position in the support 5 by means of a screw 8. On the end of said support is a hollow arbor set with a clearance 9, which is adapted to receive a workpiece: llll being treated, and which is held in the middle position on the support 5 by two flat springs 12 arranged to extend parallel to the axis of the support 5.

Simultaneously the arbor 110 is held on the support 5 by the punches s and 7, the latter of which enter the arbor ports 11?: and ld, said arbor it) being capable of displacement across the support 5 and along the punches 6 and 7 to a value corresponding to the clearance 9 when forming projections 15 and lo on the workpiece til.

This is attained in view of the rectangular cross section of the support 5 as shown in FIG. 3, the clearance 9 being formed between the arbor it]! and support 5 only from the side of the punches n and 7.

in side recesses 117 and lb (FIG. 2) of the base plate 3 there are mounted, coaxially with the punches 6 and 7, rotary heads 19 and 20 having forming rollers 211 set on axles 22, and which serve as dies for forming the projections l5 and it on the workpiece ill.

The heads 119 and 2ft are partly located in spindles 23 (FIG. 11) each having a toothed cylindrical gear 24 adapted to mesh with gears 25 (only one of the latter being shown). The gears 25 are fixed on a shaft 26 of a reducing gear (not shown) which is connected with a motor 27 adapted to impart rotation to said heads.

In addition to rotation, the heads 19 and 2th provide for a progressive displacement in conjunction with the spindles 23 in the direction of the arbor lit) with the aid of a drive 28 formed by wedge-shaped elements 2'9 and 3th. The elements 29 and 3t) are connected with the spindles 23 by means of an advancing link 31, and by turning levers 32 and 33 arranged on a movable crosspiece 3d, the heads cooperate with inclined (Illworking planes 35 on the wedge-shaped elements 29 and 30 through their rollers 36.

in order to provide for the alternate displacement of the heads 19 and 20 towards the arbor 16, one of the wedgeshaped elements 29 or 30 is turned through 180 relative to the other such element, so that in the forward stroke of the crosspiece 34 the lever 32 cooperates with one of the wedgeshaped elements, while in the reverse stroke of the crosspiece 34 the lever 33 cooperates with the other element, the return motion of the heads 19 and 20 from the arbor 10 being ensured by the provision of springs 37 which act upon the link 31.

Mounted on supports 38 opposite the inclined working planes of the wedge-shaped elements 29 and 30 are guides 39 and 40 which are adapted to ensure the pressing of the rollers 36 of the levers 32 and 33 against the inclined planes 35 of the elements 29 and 30 during the movement of the crosspiece 34.

Each support 38 respectively carries a single cam 42 or 43 which is rotatable about an axle 41 and which has a chamfer 44, the cams in their normal position being pressed by means of a spring 45 through a lever 46 connected with the cams, against the guides 39 and 40. The chamfers 44 of the cams 42 and 43 are arranged in parallel so as to provide for the alternate cooperation of the levers 32 and 33 with the wedgeshaped elements 29 and 30 during the movement of the crosspiece 34.

In order to adjust the rate of advance of the heads 19 and 20 with the forming rollers 21 and, consequently, the height of the projection 15 or 16 being formed on the workpiece 11, the supports 38 are displaceable, by means of an adjustment screw 47, relative the table 1 by removing fastening bolts 48.

A plate 49 serving for the removal of finished articles from the arbor 10 is movably mounted on the support 5 below the arbor 10. During motion, the plate 49 is guided by the support 5 and a sleeve 50 in the central recess 4 and, through the use of a screw 51 and washer 52, adapted to rest against a crossbar S3 rigidly connected with the washer 52 and, by means of rods 54, is aligned with the crosspiece 34. A hollow rod 55 is passed through the washer 52 and cross bar 53. The hollow rod 55 is provided with an external thread, whereby a spring 56 located on the rod is pressed by the action of a nut 57 to on the thread against the washer 52, which in turn is thereby pressed against the screw 51 of the plate 49.

The screw 8, which is adapted to hold the punches 6 and 7 in position in the support 5, passes through the rod 55 and is provided at its free end with a handle 58.

As pointed out above, the levers 32 and 33 are pivotally secured on the crosspiece 34. The levers 32 and 33 are respectively maintained in a normal position by a spring pusher 59 and a spring 60, in effect, when the rollers 36 of the levers are positioned opposite the chamfers 44 of the earns 42 and 43. Adjusting screws 61 are provided for setting the levers 32 and 33 to a required position.

Similarly mounted on the crosspiece 34 is a hollow rod 62 which is received by a shank 63 having spring 64 mounted therein and which rests against shoulders 65 on the rod 62. The rod 62 provides for additional centering with its sides of the workpiece 11 on the arbor 10, and also for lowering the plate 49 during the forward stroke of the crosspiece 34, whereas the workpiece 11 is basically centered on the arbor 10 by means of a spring-biased pointed rod 66 located inside the rod 62.

In the end portion of the rod 62 there are provided longitudinal slots 67 (shown in more detail in FIG. 2) which are adapted for the displacement therein of projections 68 of a spring-biased clamp 69 serving to position the workpiece 11 on the arbor 1t).

The device disclosed herein operates in the following manner.

The workpiece 11 (a socket with a hole in the bottom) is positioned coaxially with the support 5 on the plate 49 which is held by spring 56 in its upper position. During the downward motion of the slide 2 the crosspiece 34 moves down, the end of the pointed rod 66 enters the hole in the workpiece 11 whereby the latter is centered on the axis of the support 5. The hollow rod 62 is displaced relative to the rod 66 and effects with its sides additional centering of the workpiece 11 relative to the support 5. Moving on, the rod 62 thrusts against the plate 49 and moves the latter downwards together with the workpiece 1 1 pressing against the spring 56, while the clamp 69 moving in the slots 67 of the rod 62 positions the workpiece 11 on the arbor 10.

During further movement of the slide 2 together with the crosspiece 34, the plate 49 thrusts against the bottom of the recess 4, the hollow rod 62 stops while retaining the plate 49 and the workpiece 11 on the arbor 10 with its clamp 69, and the crosspiece 34 begins a displacing motion relative to the rod 62.

In order to avoid the forming of an excessive load acting upon the workpiece 11, the rods 54 of the crosspiece 34, at the moment the rod 62 thrusts against the plate 49, force away the cross bar 53 and the washer 52 connected thereto.

Further, the roller 36 of the right-hand lever 32 moves upon the chamfer 44 of the cam 42, passes over it onto the guide 39 and contacts the inclined plane 35 of the wedge-shaped element 29, thereby effecting the displacement of the rotary head 19 with the rollers 21 towards the workpiece 11. The positions of the roller 36 of the lever 32 are shown in broken line in FIG. 1.

The head 19 acts with its rollers 21 upon the workpiece 11, causing the latter to be displaced together with the arbor 10 by an extent corresponding to the value of the projection height across the support 5 and along the punches 6 and 7, with the rollers 21 forming the projection 15 relative the punch 6, as a result of which simultaneously effecting the operations of drawing and pressing out of the metal. As soon as the roller 36 of the lever 32 passes the guide 39, the spring pusher 59 pushes this lever to the right, and the head 19 together with the wedge-shaped element 29 is returned by the spring 37 to its initial position. The arbor 10 with the workpiece 11 is returned to the middle position by the flat springs 12.

Simultaneously, there is effected a movement of the lefthand lever 33 whose roller 36 moves upon the chamfer 44 of the cam 43 removing the lever to the left, as a result of which this prevents cooperation between the lever 33 and the wedgeshaped element 30 so as to stop the rotary head 20 from moving forward. The roller 36 moving to the lower position, the lever 33 is forced to the right by the spring 60. The positions of the roller 36 of the lever 33 are likewise shown in broken line in FIG. 1.

Thus, the crosspiece 34 ends its forward stroke when the lever 32 is moved to the right from the clearance between the guide 39 and the element 29, while the lever 33 is moved to the right so as to face the clearance between the guide 40 and the element 30.

The crosspiece 34 then performs its reverse stroke, as a result of which the roller 36 of the right-hand lever 32 is displaced from the opposite side of the guide 39, thereby acting upon the cam 42 to turn the latter about the axle 4 1 and, unobstructed, without cooperating with the element 29, passes beyond the guide 39, whereupon the cam 42 is once more pressed against the guide under the action of the spring 45. The roller 36 of the left hand lever 33 is pressed by the guide 40 against the inclined plane 35 of the wedge-shaped element 30, causing the rotary head 20 with the rollers 21 to move towards the arbor 10 supporting the workpiece 11.

The process of forming the projection 16 on the workpiece 11 takes place simultaneously with that of forming the projection 15, after which the arbor 10 is in a similar manner returned to its former position under the urging of the springs 12.

During further movement of the slide 2 with the crosspiece 34, the roller 36 of the lever 33 turns the cam 43 about the axis 41 and passes, unobstructed, beyond the guide 40; the head 20 being returned by the spring 37 to the initial position,

s am-s4 and the plate 49 being displaced by the spring 56 relative the support 5, thereby removing the finished article from the arbor 110.

As is clearly seen from the above description of the operation of the present inventive device, the forward and reverse strokes of the slide 2 are employed for carrying out the working operations, whereby a high production efiiciency is attained. Moreover, practice has indicated that higher quality articles are obtained in this manner.

We claim:

ll. A device for forming projections on the sides of hollow workpieces, comprising: a stationary support; punches secured on said support perpendicular to its axis; a hollow arbor with ports, adapted for setting a workpiece thereon and maintained at the end of said support by the punches entering its ports so that the arbor is capable of lateral displacement relative the support along said punches; heads with forming rollers, said heads being arranged coaxial with the punches exteriorly of the arbor and adapted to form projections on the workpiece relative to the punches; means adapted to impart rotation to said heads; a drive imparting alternate reciprocation to said heads toward the arbor and back for forming projections on the workpiece by the forming rollers while the arbor with the workpiece is being displaced by the heads relative to the punches and the support.

2. A device according to claim ll, wherein the arbor is set on the end of the support with a clearance from the side of the punches so as to effect lateral displacement of the arbor, and two flat springs arranged parallel with the support axis for holding said arbor on said support in the middle position thereof.

3. A device according to claim ll, wherein the drive adapted to displace the heads comprises spring-biased wedge-shaped elements connected with the heads, turning levers having rollers adapted to cooperate with said elements a progressive movable crosspiece having said levers secured thereto, whereas in order to effect alternate displacement of the heads, the wedge-shaped element of one of the heads is turned through 180 relative the other wedge-shaped element.

Man

i. A device according to claim 3, comprising guides positioncd opposite the inclined plane of the wedge-shaped ele ments said guides pressing the rollers of the turning levers against the inclined plane of the wedge-shaped elements during the crosspiece displacement.

5. A device for forming projections on the sides of hollow workpieces, comprising: a stationary support; punches secured on said support perpendicular to its axis; a hollow arbor with ports, adapted for setting a workpiece thereon and maintained by the punches entering its ports at the end of said support to provide a clearance with the side of the punches; heads with forming rollers, arranged coaxial with the punches exteriorly of the arbor and adapted to form projections on the workpiece relative to the punches; means adapted to impart rotation to said heads; wedge-shaped elements connected with said heads, one of said elements being turnable through l with respect to the other element; a progressively movable crosspiece; turning levers with rollers supported on said crosspiece, said turning levers adapted to alternately cooperate with the wedge-shaped elements during the forward and reverse strokes of the crosspiece and causing effecting the forward movement of the heads towards the arbor for forming projections on the workpiece by the forming rollers while the arbor with the detail workpiece is being displaced by the heads to an extent corresponding with the value of the clearance relative to the support.

6. A device according to claim 5, including a spring-biased pointed rod secured on the crosspiece, coaxially with the stationary support, said rod being adapted for centering the workpiece relative to the arbor, said pointed rod being arranged in a further hollow spring-biased rod adapted to effect additional centering of the workpiece with its sides and carrying a spring-biased clamp for setting the detail mounting the workpiece on the arbor.

7. A device according to claim 5, including a plate for removing a finished article from the arbor movably mounted on the support below the arbor supported thereon, a cross bar against which said plate a is supported, and rods aligning said cross bar with the progressively movable crosspiece. 

1. A device for forming projections on the sides of hollow workpieces, comprising: a stationary support; punches secured on said support perpendicular to its axis; a hollow arbor with ports, adapted for setting a workpiece thereon and maintained at the end of said support by the punches entering its ports so that the arbor is capable of lateral displacement relative the support along said punches; heads with forming rollers, said heads being arranged coaxial with the punches exteriorly of the arbor and adapted to form projections on the workpiece relative to the punches; means adapted to impart rotation to said heads; a drive imparting alternate reciprocation to said heads toward the arbor and back for forming projections on the workpiece by the forming rollers while the arbor with the workpiece is being displaced by the heads relative to the punches and the support.
 2. A device according to claim 1, wherein the arbor is set on the end of the support with a clearance from the side of the punches so as to effect lateral displacement of the arbor, and two flat springs arranged parallel with the support axis for holding said arbor on said support in the middle position thereof.
 3. A device according to claim 1, wherein the drive adapted to displace the heads comprises spring-biased wedge-shaped elements connected with the heads, turning levers having rollers adapted to cooperate with said elements a progressive movable crosspiece having said levers secured thereto, whereas in order to effect alternate displacement of the heads, the wedge-shaped element of one of the heads is turned through 180* relative the other wedge-shaped element.
 4. A device according to claim 3, comprising guides positioned opposite the inclined plane of the wedge-shaped elements said guides pressing the rollers of the turning levers against the inclined plane of the wedge-shaped elements during the crosspiece displacement.
 5. A device for forming projections on the sides of hollow workpieces, comprising: a stationary support; punches secured on said support perpendicular to its axis; a hollow arbor with portS, adapted for setting a workpiece thereon and maintained by the punches entering its ports at the end of said support to provide a clearance with the side of the punches; heads with forming rollers, arranged coaxial with the punches exteriorly of the arbor and adapted to form projections on the workpiece relative to the punches; means adapted to impart rotation to said heads; wedge-shaped elements connected with said heads, one of said elements being turnable through 180* with respect to the other element; a progressively movable crosspiece; turning levers with rollers supported on said crosspiece, said turning levers adapted to alternately cooperate with the wedge-shaped elements during the forward and reverse strokes of the crosspiece and causing effecting the forward movement of the heads towards the arbor for forming projections on the workpiece by the forming rollers while the arbor with the detail workpiece is being displaced by the heads to an extent corresponding with the value of the clearance relative to the support.
 6. A device according to claim 5, including a spring-biased pointed rod secured on the crosspiece, coaxially with the stationary support, said rod being adapted for centering the workpiece relative to the arbor, said pointed rod being arranged in a further hollow spring-biased rod adapted to effect additional centering of the workpiece with its sides and carrying a spring-biased clamp for setting the detail mounting the workpiece on the arbor.
 7. A device according to claim 5, including a plate for removing a finished article from the arbor movably mounted on the support below the arbor supported thereon, a cross bar against which said plate a is supported, and rods aligning said cross bar with the progressively movable crosspiece. 